16318561 has 8 divisors (see below), whose sum is σ = 19293120. Its totient is φ = 13504848.

The previous prime is 16318559. The next prime is 16318567. The reversal of 16318561 is 16581361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16318561 - 2¹ = 16318559 is a prime.

It is a super-2 number, since 2×16318561² = 532590866221442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16318567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39991 + ... + 40396.

It is an arithmetic number, because the mean of its divisors is an integer number (2411640).

Almost surely, 2^16318561 is an apocalyptic number.

It is an amenable number.

16318561 is a deficient number, since it is larger than the sum of its proper divisors (2974559).

16318561 is an equidigital number, since it uses as much as digits as its factorization.

16318561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80423.

The product of its digits is 4320, while the sum is 31.

The square root of 16318561 is about 4039.6238686294. The cubic root of 16318561 is about 253.6455727939.

The spelling of 16318561 in words is "sixteen million, three hundred eighteen thousand, five hundred sixty-one".